Elevation-adjusting device for machine guns



@QL 19 ma@ mams@ W. C. L. HAUBRQE ELVATION ADJUSTING DEVICE EQR MCHINE GUNS Fld Sept. 5, 1924 l 'Figi @w fr@ g mvENTOR grromv Patented @et i9, i926.

WERNER CHRISTIAN LASSEN "HAUBRE, OF COPENl-IAGEN, DENMARK.

ELEVATION-ADJUSTNG DFVCE FR MACI'INE GUNS.

Application filed September 3, 1924, Serial No. 735354:?, and in France October 25, 1923.

'lhe presentinvention relates to a device adapted to adjust the elevation of machine guns. Such elevation adjusting devices are used during indirect firing or firing in darkness, the machine gun being adjusted for the given firing range.

The invention is illustrated on the drawing:

Fig. 1 showing a portion of a machine gun with the elevation adjusting device in side view.

Fig. 2 the elevation adjusting device proper, in side view and on a larger scale,

Fig. 3 a vertical longitudinal section of the same,

Fig. 4 the same in top view, and

Figs. 5 to 8 some details.

a is a case fitted at top with a recess ZJ into which there is inserted a spirit level (Z pivoted about a pin c and actuated by a spring e. rlhe latter tends to turn the spirit level in such a manner that a steel rail ,f removably attached on the bottom side of the level is constantly held pressed against r the edge of a cam disc t provided with teeth g and adapted to be turned together with a shaft z' journalled in the case a. Outside of the front wall y' of the case an arm 7c is attached to the said shaft e' by means of two dogs Z on the rear side of the arm, Figs. 7 and 8, engaging a slot m, Fig. 8, in a disc a fixed on the shaft. The outer face of the front wall l7' is provided with a scale 0, Fig. 2. Opposite the division lines of the said scale small recesses p are provided on the front wall, said recesses being adapted to eo-operate with a spring-actuated pin g, Figs. 7 and 8, on the rear side of the arm 7c, so that the arm may be held in the position corresponding to a certain range.

0n the bottom of the case there are two fixed stops r and s adapted to limit the rotation of the disc 7L to one and the other side, respectively. On the forwardly directed edge of the case there is provided an arm t carrying a plate e provided with a dove-tailed slot 'a adapted to attach the case to the trigger plate of the gun, the said trigger plate being provided with a lug corresponding to the said dove-tailed slot.

When the gun is to be adjusted for firing, it is first adjusted in horizontal position by means of the spirit level which is parallel to the core line of the gun, at which time the pin g of the lever 7c is in the position corresponding to the division line 0. The arm 7c is then turned onto the division line corresponding to the given firing range, and the gun is then adjusted in such a manner that the bubble of the spirit level again becomes central. The gun may then be given the desired elevation, without calculation by means of tables, and the proper elevation may be maintained at any time,

when the operator or his assistant takes care that the bubble of the level continues to stand in central position.

rlhe elevation adjusting device, of the construction shown, is attached to the left hand side of 'the gun, when during firing the gun is to be given some positive elevation. lf, on the contrary, the elevation is to be negative7 the elevation adjusting device should be placed on the right hand side of the gun, so that the otherwise rearward edge of the case will then be pointing forward.

As mentioned above, the rail 7 is det-achable. By this arrangement the rail may easily be exchanged for another one either thicker or thinner, when the device is to be used on a gun the height of the sight-line of which differs from the height corresponding to a certain thickness of the rail 7.

Having thus described my invention, what l claim is l. rlhe combination with a machine gun, of an elevation adjusting device comprising a casing removably secured to the gun, a shaft mounted for rotation in said casing, a toothed cam disc carried by said shaft within the casing, a spirit level pivoted in said casing and carrying a member adapted to engage the teeth of said cam disc, tension means for maintaining said spirit level in engagement with the cam dise, said casing having a graduated scale on the outer face thereof, and an arm secured to said shaft and movable over said scale thereby to change the position of the spirit level with relation to the horizontal.

2. The combination with a machine gun, of an elevation adjusting device comprising a casing removably secured to the gun, a shaft mounted for rotation in said casing, a toothed cam disc carried by said shaft within the easing, a spirit level pivot-ed in said casing and carrying a member adapted to engage theteeth of said cam disc, said member being removable from the spirit level thereby lto permit substitution of another member, tension means for maintaining said level in engagement with the cam disc, said easing having a graduated scale on the outer fece thereof, and an arm sespirit level With relation to the horizontal. l0

In testimony whereof I have signed my name to this Specification.

WERNER CHRISTIAN LASSEN HAUBROE. 

